Quote:
Originally Posted by Aveomiler
I just want to know if there is a general rule.
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There isn't.
Usually you're OK to block the upper grille, and have all cooling done through the lower openings.
If you want to go even further, cover part of the lower grille, and then progressively block a larger part with something you can easily remove if needed.
Find out at which temp your thermostat opens.
Watch the temperatures closely when doing a lower grille block - preferably on something more accurate than the built-in temp gauge.